drei.host has no MX records.
Question and response
Question
dig drei.host. MX
Answer
The response has no answer records.
Authority
drei.host. 3600 SOA adns1.drei.com. at\.dns.drei.com. 2026011601 14400 3600 604800 3600
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0